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Solved! by gries. See the answer in context.
I seem to see this convention used in Euro books more than US publications. Neufert Architect's Data shows it with the apex at the top, or hinge of the ramp. The way I forced myself to remember it is that if i spilled a glas of milk at the top of the ramp, them it would spread out like the line do.
I always find it best to label the ramp so there is no confusion instead of relying on this convention.
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